Grinding-mill.



Patented Oct. 2, I900. E. HARDS.

No. 658,84l.

GRINDING MILL.

(Application fllad Aug. 12, 1899.)

2 Sheets$heet I.

(No Model.)

AnomIc-y.

Nrrnn EDWARD HARDS, OF FREMONT, NEBRASKA.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent N 0. 658,841, dated October 2,1900.

Application filed August 12, 1899. Serial No. 7271031. \No model.) i

To all whom it may concern- Be it known that I, EDWARD HARDS, residing at Fremont, in the county of Dodge and State of Nebraska, have invented certain useful Improvements in Grinding-Mills; and Ido hereby declare that the following is a full, clear, and exact description thereof, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to a mill.

The object of my invention is to provide a mill in which the two grinding-disks will be self-adjusting, the aim of my invention being more particularly to provide a simple device that shall be efficient and readily operated.

In the accompanying drawings I have shown, in Figure l, a side View of a mill, with portions removed, embodying my invention. Fig. 2 shows a top view thereof. Fig. 3 shows a front view of the stationary disk and its connected housing. view of the movable and adjustable disk,with its portion of the retaining-housing. Fig. 5 shows an enlarged plan View of the grindingbur having the finest dress. Fig. 6 shows a face view of the coarse-dress grinding-bur. Fig. 7 shows a sectional view of the finer-dress grinding-bur. Fig. 8 shows a sectional View of the coarser-dress bur, while Fig. 9 shows a broken detached view of the finer-dress bur as used in my invention.

My invention embodies, essentially, a suitable standard, comprising the sills Q and the uprights E and F, to which uprights are secured the boxings G and H, within which is held a suitable shaft 0, provided with a drivepulley D.

Positioned in front of the standard E is a disk housing,cornprising the two half-sections A and B,'which can be readily disunited. Into the housing-section A extends a hopper I, as is shown, while at one side the housings A and B are provided wit-h the hooded escapeopenings 0, as is shown.

Positioned within the forward portion of .the housing A is a stationary grinding-bur M, a face View of which is shown in Fig. 5. This grinding-bur M is provided with a dress in the form of a round-bottomed groove spirally circling about the face of the grinding- Fig. 4 shows a front bur. In referring to Fig. 5, thegroove it, it will be noticed, begins at the upper edge of the disk and gradually circling inward and terminating at the opening S, which has the inner end enlarged, as is shown at 1' in Figs. 5 and7. The face of this grinding-bur is flat, and the spiral is next mutilated by means of radial cuts J, referring now to Fig. 9, which cuts are of a varying depth, .being shallow near the peripheral edge of the disk, but increasing in depth toward the central opening S, and these slots or openings provide a straight section ac,from which slopes upwardly the bottom J of the groove, as will be understood in referring to Figs. 5 and 9. The wall portion x of these grooves is preferably in the form of a slight curve radiating tangentially from the opening S. These two-sided depressions J form the cut or dress of the bur, while the spiral grooves form the furrows of the burs in that they tend to feed the stock toward the center.

Positioned adjacent to the stationary grinding-bur M is a second grinding-bur N, a face view of which is shown in Fig. 6, and this grinding-bur is mounted upon the shaft 0, revolubly held within theboxings G and H, as is shown in Fig. 1. This bur is also provided with a spirally-disposed feeding-furrow Z, winding toward a central opening 15 and having the radially-extending dress-cuts c';

but this feeding-furrow Z is much coarser than the feeding-furrow of the stationary bur, as will be noted in referring to Figs. 5 and 6, where the bur N is provided with a feedingfurrow of approximately seven convolutions, while the feeding-furrow of the stationary bur M comprises nine convolutions. These grinding-burs M and N are held in juxtaposition, and the material to be ground is fed between them through the large openings within the stationary bur M, so that as the material feeds through the hopper I it gradu-. ally works through the opening S and comes between the burs, where it is ground but not crushed, as the differentlypitched spiral grooves have a tendency to move the stock from side to side, which insures the stock being reduced in the form of a kernel and not be crushed and flattened, which is objectionable, the stutf finally escaping out of the opening 0. i

The shaft 0 at a suitable point is provided with a collar J, within which ista ball-race, and within this ball-race are held a number of balls I), which upon the opposite side are engaged with the disk K, having ears 0, which are engaged by the forked end H of the lever L, pivoted at the pointf and having the extension d, upon Which extension is a suitable weight W, so that the bur N is normally forced against the bur M. The pressure with which the bur M rides against the bur N may be nicely controlled by means of the weight W, which is adj ustably secured to the stem d, so that the greater or lesser degree of pressure may be exerted by the bur N upon the bur M.

My invention is noticeable because of its extreme simplicity; and

Having thus described my said invention, what I claim as new, and desire to secure by United States Letters Patent, is-

In a grinding mill of the character described, a supporting-frame, a shaft revolubly and horizontally adjustable within saidframe, a collar fixed to said shaft, an approximately vertically-positioned lever pivoted to said frame, the upper end of which is adapted to work against said collar, a stem extending from said lever, a weight adjustable upon said stem so arranged that said lever exerts a pressure against said collar, a coarse-dress grinding-bur fixed to said shaft, said bur being provided with a spirally-disposed feedingfurrow and radially-disposed sloping dresscuts feeding toward the peripheral edge of said grinding-bur, a second stationary bur positi'oned adjacent said first-mentioned bur of a finer dress and provided with a plurality of sloping dress-cuts feeding toward the peripheral edge of said bur, and a housing provided with an intake-hopper and an escapeopeningsurrounding said grinding-burs.

Signed in the presence of two witnesses.

EDWARD HARDS.

Witnesses:

WILLIAM G. MERCER, GEO. A. STOREY. 

